Electrical measuring instrument.



Patented JuIy l6, won.

v E. w ssmm ELECTRICAL MEASURING INSTRUMENT.

(Application filed June 3, 1901.)-

(No Model.)

MI W llrirTEn STaTEs PATENT EETcE,

EDlVAED \VESTON, OF NEW'ARK, NEVJ JERSEY.

ELECTRICAL MEASURlNG ENSTRUMENT.

SPEGIFEGATION forming part of Letters Bate-zit 1550.. 678,70 5, dated July 16, 1901.

Original application filed December 18, 1899, Serial No. 740,843. Divided and this application filed June 3,1901. Serial To all 1072,0772 it may concern:

Be it known that I, EDWARD WESTON, a subject of the King of Great Britain, residing at Newark, in the county of Essex and State of New Jersey, have made a new and useful Invention in Electrical Measuring Instruments, of which the following is a specification.

My invention is directed to an improvement in connection with the manufacture of movable or rotary coils for electrical measuring instruments, and particularly such as are disclosed in Letters Patent heretofore granted to me, special reference being had to United States Patent No. 611,722, of October 4, 1898, and has for its objects, first, to provide means for supporting the delicate frame or spool upon which the movable coil is wound during the time it is being constructed and while the pivot-pins are being secured thereto, and, second, to provide means whereby the completed coil when so constructed may be transported from place to place at will without danger of injury either to the spool or the coil, the supporting means being removed when it is desired to assemble all of the parts or" the instrument.

The present'application is a division of an application filed by me in the United States Patent Oflice on the 18th day of December, 1899, bearing Serial No. 740,843, and the invention will be fully understood by referring to the accompanying drawings, all of which are upon an enlarged scale.

Figure l of the drawings is a perspective View of the completed article, and Fig. 2 is a transverse sectional view thereof, Fig. 3 being a plan View as seen looking at Fig. 2 from the top toward the bottom of the drawings in the direction of the arrows.

In the construction of the movable coils for electrical measuring instruments-such, for instance, as is'disclosed in the before-mentioned patent-4t is, as explained therein, important that the entire coil and its supporting frame or spool shall have as little weight as possible. It is alsoimportant that these parts shall have such a peculiar conformation as y will enable them to move in a very narrow air-space between the field-poles of the in strument, as is fully disclosed in the before (No model.) i

mentioned patent. I have found that it is desirable, therefore, in the construction of these coils that they shall be supported by a detachable or removable core, which gives them sufficient stability to be transported without injury from place to place about the shop or elsewhere during the process of construction until the time of assembling the parts of the completed instrument arrives, and it was especially with this object in view that the present invention was devised.

The invention will be fully understood by referring to the accompanying drawings in detail, in which- (t represents a frame or spool constructed, preferably, ofa thin tube of aluminium without seam or joint and of rectangular shape, with rounded corners and parallel flattened ends, side flanges being formed as shown.

A A K represent the individual sectional parts of a detachable or removable supporting-core, the outer faces of the parts A and A being convex, as shown, at thesides, so as to fit the corresponding concave inner faces of the frame or spool. One face of the part K and the corresponding adjacent face of the part A have an angular or wedge-like relation to each other, as shown, so that when all of the parts are assembled the completed core will fit snugly within the inner contour of the frame or spool, the ends bearing against the corresponding parallel flattened ends thereof, the arrangements being such that when the parts are assembled the inser-= tion of the sectional part K owing to the angular relation of one of its faces to the corresponding face A, will produce a wedge-like action, spreading the parts A and A. In a curvilinear recess in the top face of the sectional part K is secured by screws Z Z a disk j, the lateral edges of which are adapted to fit accurately in corresponding semicircular recesses in the upper faces of the upper sec tional parts A A when forced into its lower position, the arrangement being such that when all of the parts are fitted together the upper face of the diskj is flush with the upper faces of all of the sectional parts A A K as clearly shown in Figs. 1 and 2.

w represents the wire of the coil, wound upon the frame or spool, and K K the Sup p p are the pivot-pins, secured directly in the ends of the supporting-pivots. These pivots, pivot-pins, and plates are not substantially difierent from the like parts dis-' closed in the before-mentioned patent.

d cl d d are accurately-drilled cone-shaped depressions in the faces of the sectional parts A A, bearing a fixed relation to a central opening through the central part of the sectional part K the functions of these several features being for the purpose of enabling one to wind the coil upon the frame or spool after the core is in place and to enable aworkman to affix the pivot-pins to the ends of the completed coil, so that the pins 13 19 shall be located in a line passing through the mathematical axes of the completed coil, all as fully described and claimed in the original application, and no claim is made in the present application to these particular features, the present invention being directed to the assembled parts as a completed article of manufacture and for the objects and purposes hereinbefore described.

In the construction of this article of manufacture the frame or spool a may be made of any preferred conformation and in any preferred manner, and the sectional parts may afterward be inserted therein and the wire w Wound thereon, after which the pivot-pins may be affixed, or the frame or spool may be constructed in the manner described in the original application, Serial No. 7 40, 843, by the apparatus therein shown and described.

I do not limit myself to the especial form of detachable or removable core described and shown in this application, as I believe I am broadly entitled to claim as an article of manufacture a frame or spool for an electrical measuring instrument provided With a detachable or removable core adapted to enable one to wind the coil thereon and to permit of the handling or transportation of.

the completed coil from place to place without injury, and my claims are generic as to this feature, although I prefer to use the sectional removable core.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. As an article of manufacture a frame or spool and a coil wound thereon, said parts being supported by a detachable or removable core.

2. As an article of manufacture a frame or spool, a coil Wound thereon'and one or more pivot-pins secured thereto; together with a detachable or removable core supporting all of said parts.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD WVESTON.

\Vitnesses:

O. J. KINTNER, W. H. YAWGER. 

